Authorities highlighted a driver testing positive for drugs and a trailer found to have no functioning brakes.

The operation inspected 58 truck and trailers, the outcomes being:

11 electronic speed limiters downloads were conducted, with four found to be non-compliant

21 infringements were issued for various offences

28 defect notices issued including three significant weight breaches.

Though 17 fewer vehicles were inspected than earlier, the deficiency rate was very similar on the three measures reported.

"Operation Catapult is one of many operations undertaken by the Joint Traffic Task Force in order to keep unsafe trucks and drivers off our roads," acting patrol commander and assistant commissioner Michael Corboy says.

"We work closely with Roads and Maritime, the Environment Protection Authority and SafeWork NSW to ensure trucks are safe and compliant.

"Today we issued 21 infringements and handed out 28 defect notices for trucks that are not roadworthy.

"Especially in wet weather, these trucks are not only un-roadworthy, they are outright dangerous.

"Our duty is to keep the public safe and to do this we will continue to target and take action against drivers, operators, and company owners who cut corners when it comes to safety."